Hi @SanCarlino
Welcome to the forum.
Jester consoles were discontinued back in 2017, and stocks of spare PCBs have now run out. So we can support from the user/software side, but cannot guarantee that the console can be repaired if something goes wrong.
I would recommend working through the Jester ML Training Playlist here...
Yes - the latest fixture library for Jester ML consoles is v41, and is available to download from the Jester webpage...
https://www.vari-lite.com/global/products/jester-series
If you need to control a fixture that is missing from the library, you can create a fixture file to load into the console using "Zero 88 Fixture Tools". This application can be downloaded here...
https://vari-lite.s3.eu-west-1.amazonaws.com/software-firmware/Zero-88-Fixture-Tools-2.6.zip
JesterOS 4.1 is the final version for Jester ML consoles, and is very stable.
"Phantom Jester" is a Windows software package, that allows you to program and edit Jester show files on your PC. These show files can then be transferred to the console via USB. This can be downloaded from the link below...
https://www.vari-lite.com/b-dam/vari-lite/discontinued-products/jester/english/phantom-jester-4-1.zip
Hope this helps.